/Engine/Source/Editor/UnrealEd/Public/SourceCodeNavigation.h
Finds the path to a given class source. Does not rely on symbols; finds matching .build.cs files.
static bool FindClassSourcePath ( const [UField](API\Runtime\CoreUObject\UObject\UField) * InField, [FString](API\Runtime\Core\Containers\FString) & OutClassSourcePath )